What is the change in the enthalpy of 120 g/s acid heated in a double pipe heat exchanger from 25°c to 100°c, if the average heat capacity at constant pressure is 0.50 cal/g°c?

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.